Packing for pump-rods.



B. W. GOODSELL.

PACKING FOR PUMP RODS APPLICATION HLED MAR. 21. m3.

1,204,007. Patented Nov. 7, 1916.

tinrrnn s 'rA ns Parana enrich BYRON W. GOODSELL. OF CHICAGO, ILLINOIS.

I PACKING FOR PUMP-RODS.

Application filed March 2'7, 1913.

To all whom it may concern g Be it known that I, BYRON W. GoonsELL, citizen of the United States, and resident of Chicago, in the county of Cook'and State of Illinois, have invented certain new and useful Improvements in Packings for Pump- Rods, of which the following is a full, clear,

and exact specification.

This invention relates to improvements in packings for pump rods, but more particularly to 'packings, especially designed for use upon the piston rods of'ammonia or other 'machines' containing obnoxious liquids or gases, the escape of which is objectionable not only because of loss, but the discomfort and sometimes serious injury to the attendant.

Although sometimes used, rubber alone is not a desirable packing for either piston or pump rods, for the reason that it is too easily and rapidly worn awayby the friction of'such rods to prevent leakage, even the leakage of water and much more ainmonia. Y r

A prolonged use of. packings for the pistons of water pumps and especially ammonia pumps has demonstrated, that a packing containing strips of braided cotton for the wearing surface is of the best so far known, because it will fit closer, and can be held tighter against a piston, with minimum frictional resistance to a piston, and best resists frictional 'wear'from a piston, than any other 'materiaL.

Before my invention the best known packing for the piston rods of ammonia and other machines containing obnoxious liquids or gases consisted of spirally arranged strips of a laminated, non-compressible, nonresilient textile fabric, 'such for example as layers of duck or canvas, between and against which the strips of braided cotton were confined and sustained from expanding longitudinally of a piston rod, but freely to be compressed diametrically away from the rod by the frictional movement thereof to a degree producingmore or less leakagebetween the packing andythe-rod, first of the gases, if any, and then of the liquid, and especially liquid ammonia when used upon the rod of an ammonia machine, and which, as before suggested is not only objectionable because of expensive loss, but that its odors are not only obnoxious, but

Specification of Letters Patent.

Patented Nov. '7, 1916.

Serial No. 757,158.

not infrequently seriously injurious to the attendant.

The object of my invention, broadly stated, is a packing containing braided cotton for its wearing surface provided with another material so arranged with reference thereto as to produce a force constantly moving the wearing surface of the cotton fiber braid to a close and tight fit upon a piston rod against the tendency of the rod to compress it therefrom, and also taking up the frictional wear thereof. In other words, the prime object of my invention is a packing, the wearing surface of which is composed of braided cotton surrounding a piston rod in alternate arrangement with a resilient material compressing the cotton braid in a direction longitudinally of the packing, and concurrently therewith eXerting a force constantly moving the wearing surface of the cotton braid to a continuously tightening contact'and fit upon a piston.

A further object of my' invention is a packing for piston rods the wearing surface of which packing consists of braided strips of cotton, and in alternate arrangement with resilient strips, wearing away by friction faster than braided cotton, and providing continuously a force pressing the wearing surface of the cotton to a tight fit upon a piston rod surrounded by the packing.

More specifically stated, the object of my invention 'is-a packing either of cylindrical or flattened form having spiral layers, or parallel rings alternately of braided cotton,

and resilient vulcanized rubber.

packing with 'a-- cover of duck or ;other suitable material vulcanized to adherence therewith.

With these ends in view, my invention finds embodiment in certain features of novelt} in the construction, combination and arrangement of parts by which the said objects and certain other objects are hereinafter attained, all as fully described with 'reference to the accompanying drawings,

the same parts in the several figures of the drawing.

The packing in which my invention finds embodiment consists of braids 5, of cotton fibers, alternated with strips 6 of rubber,

substantially pure, which when vulcanized 1s resilient, as shown in Figs. 1 and 8, but

of which both the rubber and the braided cotton may be respectively in the form of rings 7 and 8, whether the alternating strips 'of braided cotton are spirally arranged as in Figs. 1 and 3, or in the form of rings as shown in Fig. 4.

The braided cotton portion should be closely confined by the rubber as may be when wound spirally upon a mandrel in the course of winding thereon, or as in the case of rings by an endwise pressure against the packing, and in order that the braided strips may be somewhat compressed. and held by the rubber against lateral expansion, or in other words expanding in either direction longitudinally of the packing. With strips or rings of braided cotton fiber and rubber in this arrangement, it will be seen that on vulcanizing the rubber, the braided cotton fibers will adhere thereto, and that after vulcanization the rubber will exert a force constantly tending to compress the cotton fiber braids laterally, and

thereby project them to close contact with a piston rod surrounded by the packing. In practice, however, after the strips or rings have been arranged as above described, and before vulcanization a covering 9 of rubber is applied thereto, either in the form of a cylinder or by winding thereon a sheet of rubber until the desired thickness is ob tained, whereupon the whole is vulcanized and with the result that the rubber cover and rubber strips or' rings become'an integral part of one another. 7 p

By employing a rubber covering 9, of substantially and preferably pure rubber, all sides of the braided cotton except its wearing surface are surrounded by rubber, the resiliency of which not only prevents the lateral expansion of the wearing surface of the, cotton braids away from the piston, but

on the contrary a constant lateral pressure against these braids constantly moving it forward to contact with the piston rod, thereby maintaining tight joint of the wearing surface .of the cotton with the piston rod, but to a degree sufiicient to take up the frictional wear on the cotton, and for such a length of time that a greater portion of the cotton may be worn away and yet a tighter joint be maintained than has heretofore been possible or practical. Furthermore owing to the fact that the rubber will wear away by the friction of the piston rod faster than the cotton, it follows that so longas there is enough force in the rubber to com press the cotton to contact with the rod there may be a greater wear than heretofore, and yet a tight joint still be maintained.

\Vhen a packing of my invention isin cylindrical form it is preferably provided with a covering 10 0f stout canvas or duck fittedtightly thereon before vulcanization, so that it will not only adhere closely to the rubber, but prevent an outward expansion 1 of the rubber, and thereby increase and prodi-ical form, but includes an angular form or strip such as is illustrated in Fig. 2, wherein the braided cotton strip is indi cated at 12, with three sides of it inclosed by a vulcanized resilient rubber cover 13.

Having described'my invention, what I claim and desire to secure by Letters Patent is: i I 7 1. A packing consisting of a number of strips or rings of braided cotton fiber, and

a resilient material spacing and thereby separating the wearing surfaces of said strips 'or rings from each other.' w

2. A packing consisting ofa number of strips or rings of braided cotton fiber, and

separate strips or rings of a resilient material alternately spacing said first named strips or rings from each other.

3. A packing, the wearing surface of which consists of strips or rings of braided cotton fiber and pure rubber, arranged alternately one with the other.

4. A packing, the body of which is composed of rubber, and strips or rings of braided cotton fiber embedded and spaced apart in said rubber. V V H 5. A packing, the wearing surface of which consists of separate strips or rings of braided cotton fiber and rubber, alternately separating said strips or rings, and a surrounding external cover consisting of resilimy hand and afiixed my seal, this 24th day ent vgdcanized rubber. of March, A. D. 1913.

6. packin tie body of Which consists of rubber prov ided with rings or strips ern- BYRON GOODSELL' 7, bedded therein, and a non-elastic flexible Witnesses:

covering surrounding said body. J OHN H. MoELRoY, In Witness whereof I have hereunto set MILDRED ELSNER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

